Viessmann Refrigerant Undercharge / Low Refrigerant Protection

System stops; F0 error; may occur during cooling startup

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Refrigerant leak in indoor or outdoor coil, Loose flare connections on refrigerant lines, Micro-leak at service valves, Improper initial charging

Safety: Refrigerant is under pressure and must be handled by certified personnel.

Visual leak check: Look for oil stains on flare joints, coils, and service valves, which indicate leaks.
Listen and smell: In a quiet environment, listen for hissing near joints. Do not inhale refrigerant.
Technician service: A licensed technician should perform leak detection (soap solution, electronic detector), repair leaks, evacuate, and recharge the system to Viessmann specifications.

Professional Required 5/5

Refrigerant Circuit (Leak Repair and Recharge)

Check Price on Amazon

We may earn a commission from links on this page.